Jacketed heater



Aug.- 20,4 1929. F. G. sHERBoNDY 1,724,974

-JAcxETan munn Filed umh 22, 1926 z'sneets--Q'neet 2 u f vIIWENTOR.

Patented Aug. 20, 1929. l UNITED STATES PATENT OFFICE.

FREDERICK G. SHERBONDY, F AKRON, OHIO, ASSIGNOR TO THE BIGGS BOILER- WORKS COMPANY, A CORPORATION OF OHIO.

J'ACKETED HEATER.

Application filed March 22, 1926. Serial No. 96,492.

This invention relates to improvements in Figure 2 is a vertical transverse sectional heating devices in general and has particuview on the line 2 2 of Figure .1; lar reference to jacketed heaters for use in Figure 2 is'an enlarged vertical section treating rubber and other articles, as in. v ulshowing a detail modification; n e 5 canizing, impregnating and devulcanizing Figure 3 is a view similar to Figure 1,11- 60 processes. lust-rating another embodiment of the 1n- Such devices, heretofore, have usually 1nvention; and eluded inner and outer shells assembled` tovFigure 4 is a Sectional View 0n the line gether in spaced relationship and rigidly 4 4 0f Figure 3,

fastened together by stay-bolts and the like. The improved heater illustrated in Fig- 65 The rigid connection of the two shells in this iii-es 1 and 2 is 0f the horizontal typeand IIILIlllSlglVeS IlSe t0 H13/Dy SGIlOllS ObJeCillOIlS. includes inner and Outer shells and For instance, not only are the manufacturing provided with Closed ends 12 137 respeeoperations expensive and tedious, but 1n adtively7 the Outer Shell being spaced from the i5 dition the stay-bolts as well aS the SllcllS sides and closed end of the inner shell to 70 themselves are frequently overstrained or foi-in a heating Chamber 14 The Shells 1.0 damaged by the tendency of the Shells 'E0 and 11 are secured together adjacent their expand and contract to different extents due Open ends by rivets 157 0r other Suitable fasto the pressure and temperature differences toning means, said rivets passing through an within the treating chamber and thcjaoke. annular frame or casing 16 disposed between 75 By the present invention, these obJections the Open ends ef the two Shells in Such man are eliminated, and a jacketed heater is proner as to form a Closure for the heating duced wherein the two shells can expand and chamber 14, The two Shells are thus con- COntIaCt With perfect freedOmindependeIitly neeted together at one end only, and by S0 of each other, although capable of withdoing, they are capable of a free relative 80 Standing the eXteI'nal and. internal pressures longitudinal movement Caused by unequal exerted thereon when the heater is in use, expansion and contraction when the heater and wherein the weight of the inner shell is in use. and its contents is properly transmitted and The interior 0f the Shell 10 forms a treatuniformly distributed t0 the Outer Shell. ing Chamber 18 t() which aCCeSSS may be had 80 An important feature Of llS lHVeIltlOD, through a door 19 or other removable clothelefOIe, in its bIOaCleI aspects, iS t() plO- sure Ingang 0f any Ordinary 0r preferred Vide a heater 0f the abOVe-InontiOned Chaltype, Said door Cooperating with the outer acter including spaced shells capable Of iIlface 20 of the annular casing 16 to seal the dependent expansion and contraction. treating chamber when in use. An inlet 90 Another feature is to provide such heater pipe 21 communicates with the treating with novel means for reinforcing the inner Chamber 18 and through this pipe the treatshell. ing medium such as steam, hot water, gas

Another feature is to provide such heater orthe like, is introduced in carrying out the with suitable means for maintaining the two particular process for which the heater is to shells in their proper spaced relationship be used. The treating medium may be disand for transferring the weight of the incharged from the Chamber 18 through a ner shall with its contained load to the outer drain or outlet pipe 22. Sheund 'the Supporting base- A heating medium such as steam is intro- Another feature is to provide a heater duced into the heating chamber 14 through 100 which will be simple in construction, strong a port 23 in the outer shell or jacket 11, and and durable in service, economical to manuafter use is discharged through an exhaust facture, and a substantial improvement in port 24. The temperature within the heatthe art. ing chamber 18 may be easily maintained or 105 ,In the drawings forming a part of this controlled as desired, and by way of accesapplication, and wherein similar reference sory equipment a safety valve, gauge, or the characters designate corresponding parts like may be connected at 25'in communicathroughout the several views, Figure 1 is a tion with the chamber 14. vertical longitudinal sectional view ,showing As the heater is ordinarily used, there is 11u one embodiment of the invention; a .Substantial difference between the pres.

shown, or they may sures within the two chambers 14 and 18, the pressure within the chamber 18 usually being greater than that in the surrounding chamber 14, although the conditions may be reversed according to the process involved. It is therefore necessary to reinforce the inner shell 10 against collapsing or bursting pressure, and for this purpose annular reinforcing members 26 are secured as by rivets 27, to the inner shell 10. These reinforcing members 26 are shown as of channel formation in cross-section, although other structural forms may be used with equal advantage, and extend partly across the space 14 but not far enough to interfere with the circulation of the heating medium. Any number of reinforcing member-s 26 may be used, dependent upon the proportions of the apparatus, three being shown suitably spaced apart vin Figure 1, and if desired, the shell 1() can be further strengthened by the use of supplementary reinforcements 28. The reinforcements 28 are preferably corrugated, and may be in the form of strips spaced around the periphery of the shell 10, as

be of circular or cylindrical form to completely or partially surround said shell.

Suitable supports 29 are provided for maintaining the heater in its horizontal position; and to facilitate insertion and removal of goods to be treated, a pair of spaced truck-rails 30 may be mounted in the bottom of the treating chamber.

In order to relieve the rivets 15 of the .shearing stresses incident to sagging of the inner shell 10 at its closed end 12, spacing blocks Vor shims 17 are mounted between the twov shells at the underside of the heater and at different points in its length. rIhe blocks 17 thus maintain the two shells in proper' spaced relationship, and also transmit the weight of the inner shell 10 and its contents to the outer shell or .jacket 11 and its supports 29. The blocks 17 are preferably but not necessarily attached to the outer surface of the shell 10 and have 4sliding engagement with the inner surface of the jacket 11 so as not to interfere with the free relative movement of these parts due to the unequal expansion and contraction previously mentioned. In Figs. 1 and 2, only two spacing blocks 17 are shown, but if desired (and as indicated in the embodiment illustrated in Figs. 8 and 4) other blocks may be placed at other points around the circumference to relieve the rivets 15 of strain in the handling or shipment of the heater. However, in such case, it is preferred to place the blocks far enough apart to avoid any interference with the circulation of the heating medium through the chamber 14, although the same effect could be produced by making the spacing blocks in the form of rings cored to permit the passage of steam. In the modification illustrated in Fig. 2a, the spacing blocks 17 are shown as attached to or mounted within the channel-rings 26 (rather than attached directly to the inner shell 10). By this modified arrangement, the load of the inner shell may be bet-ter transmitted to the spacing blocks, since the inner shell is stronger and more rigid where the channel-rings are attached, and since these rings act to distribute the whole dead-load weight equally around the entire circumference of the inner shell. As a further modification, when the heater is mounted upon separate supporting stands, it may be desirable to locate the spacing blocks at points directly above said stands (as in Fig. 1) so as in that way to concentrate the weight of the inner shell at those particular point-s and thus avoid unnecessary strain upon the outer shel It will be appreciated that the spacing blocks in any location will serve (at least in some degree) to reinforce the inner shell as well as to distribute the load onto the outer shell. Y

Vhile the invention may be embodied in heating apparatus for use in connection with various well known processes, it is especially adapted for a. vulcanizing process using hot water or the like as a curing medium. The goods to be vulcanized are placed withinthe treating chamber 18, which is sealed by the closure 19, and are then submerged in hot water at a temperature around 300o F. and under a pressure of approximately one hundred and fifty pounds per square inch. At or about the same time, steam at approximately fifty pounds pressure and temperature is admitted to the heating chamber 14 which envelops the shell 10. Obviously, under such conditions, the two shells 10 and 11 will tend to expand and contract unequally in a longitudinal direction, but since they are secured together at one end only as above described, they are free to move relatively to each other and thus permit such expansion and contraction without causing the slightest interference or damage. The rivets 15 are not subjected to excessive strains because the weight of the inner shell and its contents is taken by the spacing block-s 17 and distributed thereby to the outer shell or jacket 11 and the supports 29, as last described. The reinforcing members 26 and 28 provide the necessary strength to withstand the collapsing or bursting pressure to which the shell 1() may be subjected, and this without interfering kwith the free circulation of steam through the heating space 14 or the relative movement of the inner and outer shells.

In Figs. 3 and 4 another embodiment of the invention is shown, wherein the` innerV shell 31 is formed with circumferential corrugations 82 to provide the necessary mechanical strength, said shell 31 carrying spacing blocks 33, similar to the blocks 17 in the previously described form, and additional spacing blocks 34 arranged at desirable intervals around the periphery of the shell. The blocks 33 and 34 engage the inner surface of the jacket 1l and are slidable thereon to permit free relative movement of the two shells. In other respects, this second embodiment is so similar to that first described that any further discussion would be superfluous. However, it may be added that the corrugated form of the inner shell 31. in addition to permitting the ready expansion and contraction of the shell, provides a greater radiating surface than does a plain cylindrical shell, which feature is particularly advantageous when water is used as the vulcanizing or treating medium.

From the foregoing it will be evident that a heater has been produced which Will be simple in construction, strong and durable in service and an improvement in the art. The invention is susceptible of further modification, and the right is herein reserved to make such changes as fall Within the scope i of the appended claims without departing from the spirit of the invention. For instance, while the several improvements above described are particularly desirable in connection with heaters of the horizontal type shown, they are equally applicable to heaters of the vertical type as well, and especially when such verticle heaters present conical bottom heads which would allow the Weight of the inner shell to be transmitted to the outer' shell and still permit of a relative longitudinal movement of the two shells due to expansion and contraction.

Having thus described the invention, what is claimed is:

l. A heater comprising an inner shell forming a treating chamber, a jacket surrounding said shell and spaced therefrom to form a heating space, reinforcing channelrings surrounding the inner shell and secured thereto within the heating space,

means for connecting the inner shell and the jacket together at one end only so as to permit relative longitudinal movement of the shell and jacket due to unequal expansion and contraction, and spacing blocks disposed between the shell and jacket, said spacing blocks being secured to one of said members and having sliding engagement with the other member.

2. A heater comprising an inner shell forming a treating chamber, a jacket surrounding said shell and spaced therefrom to form a continuous heating space, reinforcing channel-rings surrounding the inner shell and secured thereto within the heating space,

means for connecting the inner shell and the jacket together at one end only so as to permit relative longitudinal movement of the shell and acket due to unequal expansion and contraction, and spacing means for distributing the Weight of the inner shell to the jacket, said spacing means comprising blocks arranged Within the reinforcing channelrings and having sliding engagement with the inner surface of the jacket.

3. A heater comprising an inner shell forming a treating chamber, a jacket surrounding said shell and spaced therefrom to form a continuous heating space, flanged reinforcing-rings surrounding the inner shell and secured thereto within the heating space, means for connecting the inner shell and the jacket together at one end only so as to permit relative longitudinal movement of the shell and jacket due to unequal expansion and contraction, and spacing members for distributing the weight of the inner shell to the jacket, said spacing members being disposed between the flanges of said reinforcingrings and having sliding engagement with the inner surface of the jacket.

In testimony whereof, I have aliixed my signature hereto.

FREDERICK G. SHERBONDY. 

